Adjustable dumbbell

ABSTRACT

The present invention relates to an adjustable dumbbell, which includes a rotatably disposed grip rod and a locking element, wherein a locking portion is disposed at both ends of the grip rod, the locking element includes a base, a movable pin and a compression spring, the movable pin is slidably disposed in the base, the base is provided with a first spring sleeve column, the movable pin is provided with a second spring sleeve column, and both ends of the compression spring are respectively sleeved and positioned on the first spring sleeve column and the second spring sleeve column. In the present invention, the base and the movable pin are both provided with the spring sleeve column, which is not only convenient to mount and position the compression spring during assembly, but also can prevent the compression spring from falling out due to the shaking of dumbbells in use.

RELATED APPLICATIONS

This application claims priority to Chinese Patent Application 202023084196.7, filed on Dec. 18, 2020, which is incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to the field of fitness equipment, in particular to an adjustable dumbbell of which the number of dumbbell pieces can be adjusted rapidly, specifically to the improvement of a rotation lock element therein.

BACKGROUND

Dumbbells, as commonly used fitness equipment, are loved by all kinds of fitness enthusiasts. The existing adjustable dumbbells, such as the most common nut locking type, require users to remove or mount dumbbell pieces one by one and then lock them with wrenches, which is complicated to use. In order to facilitate the adjustment of dumbbell pieces, as proposed in the patent with a publication number of CN111450475, it realizes the adjustment of the number of dumbbell pieces by toggling the gear ring to drive the planetary gear mechanism to transmit the telescopic rod to extend and retract, and clamps the gear teeth of the gear ring through a clamping pin element and a serrated protruding member, thereby locking the rotation of the gear ring. This kind of rotation locking element is locked by the engagement between teeth, which requires high precision in assembly. And in the prior art, there is no positioning structure to support the assembly of the compression spring in the clamping pin element. As dumbbells are often lifted, the shaking between parts of the dumbbells is large, and failure problems such as jumping out of the compression spring are easily caused in long-term use.

SUMMARY

Therefore, in view of the above problems, the present invention provides an adjustable dumbbell with an optimized structure.

The present invention is realized by employing the following technical solution:

The present invention provides an adjustable dumbbell, comprising a dumbbell piece adjustment system and a locking element, wherein the dumbbell piece adjustment system is used to adjust the number of dumbbell pieces attached to the adjustable dumbbell, the dumbbell piece adjustment system has a locking portion, the locking element includes a base, a movable pin and a compression spring, the movable pin is slidably disposed in the base, the base is provided with a first spring sleeve column thereon, the movable pin is provided with a second spring sleeve column thereon, both ends of the compression spring are respectively sleeved and positioned on the first spring sleeve column and the second spring sleeve column, and are respectively abutted against the base and the movable pin, the movable pin is tensioned to an outside of the base by means of an elastic restoring force of the compression spring and clamped into the locking portion, thereby locking the dumbbell piece adjustment system.

Wherein, in order to improve the stability of the assembly and movement of the locking element, it is preferable that the compression spring, the first spring sleeve column, and the second spring sleeve column are provided with two sets side-by-side.

Wherein, in order to improve the reliability of the sliding connection between the base and the movable pin, it is preferable that the base is provided with a U-shaped raised slideway thereon, the movable pin has a sliding groove whose shape matches the slideway, and the sliding groove and the slideway are slidingly fitted.

Wherein, in order to improve the reliability of the sliding connection between the base and the movable pin, it is preferable that the movable pin is substantially rectangular in shape and has a first side edge and a second side edge on an opposite side of the first side edge, the first side edge and the second side edge are respectively provided with two sliding grooves side-by-side, the base has a substantially rectangular inner groove adapted to the movable pin, and two opposite groove walls of the inner groove are respectively provided with two sliding grooves side-by-side.

Wherein, based on manufacturing and installation considerations, the dumbbell piece adjustment system includes a grip rod, a flange driving member, a planetary gear system and a telescopic rod, the flange driving members are fixedly assembled at both ends of the grip rod, the planetary gear system includes an outer casing and a planetary gear mechanism disposed in the outer casing, the telescopic rod is helically driven to the planetary gear mechanism, so that when the grip rod is rotated, the flange driving member drives the planetary gear mechanism to rotate and makes the telescopic rod extend and retract, thereby adjusting the number of dumbbell pieces attached to the adjustable dumbbell, the locking element is fixedly mounted on the outer casing, the flange driving member extends into the outer casing, one end of the flange driving member toward the outer casing is provided with a locking ring with an annular structure, and the locking portion is a notch disposed on the locking ring and matching a shape of the movable pin.

The planetary gear mechanism includes a ring gear, a planetary wheel, a planetary carrier and a sun wheel, the planetary carrier is fixed on the outer casing, the ring gear is in linkage connection with the flange driving member, the sun wheel is a gear shaft with a shaft hole, and the telescopic rod is connected in the shaft hole of the gear shaft through a screw pair.

The present invention has the following beneficial effects: in the present invention, the base and the movable pin slidingly connected in the locking element are both provided with the spring sleeve column, which is not only convenient to mount and position the compression spring during assembly, but also can prevent the compression spring from falling out due to the shaking of dumbbells in use.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an adjustable dumbbell in an embodiment;

FIG. 2 is a schematic view of the dumbbell body and a dumbbell piece in an embodiment;

FIG. 3 is a schematic view of the dumbbell piece in an embodiment;

FIG. 4 is a schematic view of the dumbbell body in an embodiment;

FIG. 5 is a cross-sectional view of the dumbbell body in an embodiment;

FIG. 6 is a structural exploded view of the dumbbell body in an embodiment;

FIG. 7 is a schematic view of a grip rod and a flange driving member in an embodiment;

FIG. 8 is a schematic view (first angle) of the flange driving member in an embodiment;

FIG. 9 is a schematic view (second angle) of the flange driving member in an embodiment;

FIG. 10 is a schematic view of a planetary gear system in an embodiment;

FIG. 11 is a structural exploded view of the planetary gear system in an embodiment;

FIG. 12 is a schematic sectional view of a gear shaft in an embodiment;

FIG. 13 is a schematic view of a locking element in an embodiment; and

FIG. 14 is a schematic view of a movable pin of the locking element in an embodiment.

DETAILED DESCRIPTION OF THE EMBODIMENTS

To further illustrate respective embodiments, the present invention is provided with the accompanying drawings. The drawings are a part of the disclosure of the present invention, which are mainly used to illustrate embodiments, and can be taken in conjunction with the relative depiction in the description to explain the operation principle of the embodiments. With reference to these contents, other possible embodiments and the advantages of the present invention will be understood by those ordinarily skilled in the art. The components in the drawings are not drawn to scale, and similar component signs are usually used to represent similar components.

The present invention will be further explained in conjunction with the drawings and the specific embodiments.

Referring to FIGS. 1-2, as a preferred embodiment of the present invention, an adjustable dumbbell is provided, which includes a substantially I-shaped dumbbell body 10 and a plurality of dumbbell pieces mounted and disposed at both ends of the dumbbell body 10, the first dumbbell pieces at both ends of the dumbbell body 10 are fixedly connected with the dumbbell body 10, the remaining dumbbell pieces are cumulatively mounted on the first dumbbell pieces at both ends of the dumbbell body 10. As shown in FIG. 3, each dumbbell piece is symmetrically provided with a dovetail tenon and a dovetail groove, and an accumulation of dumbbell pieces is realized by clamping of the dovetail tenon and the dovetail groove on adjacent dumbbell pieces.

Referring to FIGS. 4-6, the dumbbell body 10 has a dumbbell piece adjustment system, which includes a grip rod 1, a flange driving members 2 fixedly disposed at both ends of the grip rod 1, a planetary gear system 4 in driven connection with the flange driving member 2, and a telescopic rod assembly 6 extending inside the dumbbell body 10. The telescopic rod assembly 6 includes a first telescopic rod 61 and a second telescopic rod 62 having a substantially semicircular shaft shape. By rotating the grip rod 1, and via the transmission of the flange driving member 2 and the planetary gear system 4, the dumbbell body 10 finally makes the first telescopic rod 61 and the second telescopic rod 62 extend or retract synchronously and away from each other. The first telescopic rod 61 and the second telescopic rod 62 hang the dumbbell piece through a center hole of the dumbbell piece, so as to adjust the number of dumbbell pieces at both ends of the dumbbell body 10.

Referring to FIG. 5 and FIGS. 7-9, the grip rod 1 is tubular in shape and has a center hole for the telescopic rod assembly 6 to extend through, an outer surface of the grip rod 1 has a concave-convex texture, to increase the friction of the user's grip. The grip rod 1 and the flange driving member 2 are fixedly assembled together. The flange driving member 2 is in a substantially funnel shape with a center hole 201, includes a housing portion formed by joining of the housing 21 and a locking ring 22, and further includes a first pin 26 formed in an interior enclosed by the housing portion. The first pin 26 protrudes in an axial direction of the flange driving member 2. The housing 21 is in the shape of a shrunken cone and includes a small-diameter end toward the grip rod 1 and a large-diameter end toward the planetary gear system 4. The small-diameter end is fixedly assembled with the grip rod 1, and an outer diameter of the large-diameter end is substantially equal to that of an outer casing 41 of the planetary gear system 4, so that the large-diameter end is butted with the outer casing 41 of the planetary gear system 4 to substantially close the planetary gear and prevent problems such as the entry of dust. The large-diameter end is also connected with the locking ring 22 through the reduced diameter step 23, the locking ring 22 is annular, a plurality of notch-shaped locking grooves 221 (as locking portions) are evenly opened at a free end thereof. When the flange driving member 2 and the planetary gear system 4 are engaged together, the locking ring 22 extends into the outer casing 41 of the planetary gear system 4, so that the locking groove 221 cooperates with a locking element 40 on the planetary gear system 4 to realize the rotation lock of the flange driving member 2 and the grip rod 1 relative to the outer casing 41.

Referring to FIGS. 10-12, the planetary gear system 4 includes the outer casing 41, a planetary gear mechanism provided inside the outer casing 41, and the locking element 40 assembled on the outer casing 41. The planetary gear mechanism is composed of a ring gear 42, a planetary wheel 44, a planetary carrier 45, and a gear shaft 46 as a sun wheel. The gear shaft 46 includes a shaft and a first gear 461 as an integral. The gear shaft 46 has a hollow shaft hole, whose inner wall is provided with a concave helical groove 462 that is used to cooperate with an external thread of the first telescopic rod 61 or the second telescopic rod 62, so that when the gear shaft 46 is rotated, it drives the first telescopic rod 61 and the second telescopic rod 62 to extend or retract. The planetary carrier 45 is a revolving body with a substantially T-shaped cross-section, the planetary wheel 44 is rotatably sleeved on the planetary carrier 45, and the outer casing 41 is formed with a planetary carrier mounting hole 414 where the planetary carrier 45 is inserted and fixed, so that the planetary wheel 44 is mounted on the outer casing 41 through the planetary carrier 45. In this embodiment, five planetary wheels 44 are provided in a circular arrangement. In other embod44iments, other suitable numbers of planetary wheels can be selected according to the load born by the planetary wheels. The ring gear 42 usually meshes with the planetary wheel 44. The outer casing 41 has the center hole 412 for fitting with the gear shaft 46. One end of the gear shaft 46 is inserted into the center hole 412, and the first gear 461 on the gear shaft 46 meshes with the planetary wheel 44, so that the ring gear 42, the planetary wheel 44, the planetary carrier 45 and the first gear 461 form a planetary gear mechanism. The first gear 461 serves as a sun wheel. When the ring gear 42 is actively rotated, the first gear 461 is passively rotated, and the planetary gears form a speed-up transmission relationship.

The load-bearing iron ring 43 and the ring gear 42 are assembled and fixed. The load-bearing iron ring 43 is also screwed and fixed with the flange driving member 2, the ring gear 42 and the load-bearing iron ring 43 are respectively opened with the first slot 423 and the second slot 433 at corresponding positions for the first pin 26 to be inserted and fit. When the flange driving member 2 and the planetary gear system 4 are engaged, the first pin 26 is aligned to insert into the first slot 423 (the second slot 433) to complete positioning, and then the load-bearing iron ring 43 is screwed and fixed with the flange driving member 2 through the screw, so that the load-bearing iron ring 43, the ring gear 42 and the flange driving member 2 are connected into a whole. Through the assembling relationship that the load-bearing iron ring 43, the ring gear 42 and the flange driving member 2 are connected into a whole, as the flange driving member 2 is rotated, the ring gear 42 can be rotated, and since the flange driving member 2 is fixedly assembled with the grip rod 1, when the grip rod 1 is rotated, the ring gear 42 can be rotated, and then through the transmission of the planetary gear, the gear shaft 46 is rotated. The gear shaft 46 is fitted with the external thread on the first telescopic rod 61 or the second telescopic rod 62 through the helical groove 462 in the shaft hole to drive the first telescopic rod 61 and the second telescopic rod 62 to extend or retract.

The outer casing 41 is fixedly connected with the dumbbell piece through the dumbbell piece mounting plate 5, so that when the grip rod lis rotated, the outer casing 41 is kept stationary by means of a gravity of the dumbbell piece.

In order to avoid potential safety hazards caused by erroneous rotation of the grip rod 1 when lifting dumbbells, in this embodiment, it is also provided with a means for locking the dumbbell piece adjustment system. With continued reference to FIGS. 11 and 13-14, the locking element 40 is mounted on the outer casing 41. The locking element 40 includes a base 401 and a movable pin 402 slidably mounted in the base 401, and the movable pin always has a tendency to move radially outward toward the outer casing 41 by a compression spring (not shown) mounted between the base 401 and the movable pin 402. Specifically, the base 401 includes an inner groove 4011 substantially matching a shape of the movable pin 402, and two opposite groove walls of the inner groove 4011 are provided with a U-shaped convex sliding groove 4012 for fitting with a sliding groove 4023 on the movable pin 402 to form a sliding connection between the two. The base 401 is further provided with a first spring sleeve column 4013 for sleeving the compression spring. A shape of a main body of the movable pin 402 is substantially rectangular, and one end of the main body toward an outer side of the base 401 is provided with a locking block 4022 matching the shape of the locking groove 221, which is used to cooperate with the locking groove 221 instead of the main body of the movable pin 402 to realize locking. The movable pin 402 is provided with a sliding groove 4023, the movable pin 402 is fitted into the inner groove 4011, and the sliding groove 4023 cooperates with the sliding groove 4012 to realize the sliding connection between the base 401 and the movable pin 402. The movable pin 402 is further provided with a second spring sleeve column 4021 for sleeving the compression spring. In this embodiment, by providing the first spring sleeve column 4013 and the second spring sleeve column 4021, it is not only convenient to mount and position the compression spring during assembly, but also can prevent the compression spring from falling out due to the shaking of dumbbells in use. In addition, the compression spring, the first spring sleeve column 4013, and the second spring sleeve column 4021 are provided with two sets side-by-side, so as to improve the stability of assembly and movement of the locking element. Moreover, the sliding groove 4012 is U-shaped convex, and the sliding groove 4012 and the sliding groove 4023 are respectively provided with two side-by-side on the two opposite groove walls of the inner groove 4011 and the two opposite side edges of the movable pin 402. Such structure helps to improve the reliability of the sliding connection between the base 401 and the movable pin 402. The locking ring 22 of the flange driving member 2 extends into the outer casing 41 of the planetary gear system 4, so that the movable pin 402 is inserted into the locking groove 221 of the locking ring 22 to restrict the rotation of the grip rod 1 and the flange driving member 2 relative to the outer casing 41.

The outer casing 41 is provided with an exposure hole 413 for exposing the locking block 4022. When it is necessary to unlock the rotation of the grip rod 1 and the flange driving member 2 relative to the outer casing 41, the locking block 4022 is pressed to complete the unlocking.

In this example, a dumbbell adjustment system in the form of a grip rod drive planetary gear system is used as an example to illustrate the specific structure and function of the locking element 40. However, the locking element 40 provided in this embodiment can also be applied to other forms of dumbbell piece adjustment systems, for example, in the form of a moving driven telescopic rod with the locking element 40 locking the movement of the telescopic rod.

Although the present invention has been particularly shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, which fall within the protection scope of the present invention. 

What is claimed is:
 1. An adjustable dumbbell, comprising: a dumbbell piece adjustment system, and a locking element, wherein: the dumbbell piece adjustment system is used to adjust a number of dumbbell pieces attached to the adjustable dumbbell, the dumbbell piece adjustment system has a locking portion, the locking element comprises a base, a movable pin, and a compression spring, the movable pin is slidably disposed in the base, the base is provided with a first spring sleeve column, the movable pin is provided with a second spring sleeve column, both ends of the compression spring are respectively sleeved and positioned on the first spring sleeve column and the second spring sleeve column and respectively abut the base and the movable pin, and the movable pin is tensioned to an outside of the base by an elastic restoring force of the compression spring and clamped into the locking portion, thereby locking the dumbbell piece adjustment system.
 2. The adjustable dumbbell according to claim 1, wherein the compression spring, the first spring sleeve column, and the second spring sleeve column are provided with two sets side-by-side.
 3. The adjustable dumbbell according to claim 1, wherein: the base is provided with a U-shaped convex slideway, the movable pin has a sliding groove having a shape that matches the U-shaped convex slideway, and the sliding groove and the U-shaped convex slideway are slidingly fitted.
 4. The adjustable dumbbell according to claim 3, wherein: a main body of the movable pin is rectangular in shape and has a first side edge and a second side edge on an opposite side of the main body relative to the first side edge, the first side edge and the second side edge are respectively provided with two sliding grooves side-by-side, the base has a rectangular inner groove adapted to the movable pin, and two opposite groove walls of the rectangular inner groove are respectively provided with the two sliding grooves side-by-side.
 5. The adjustable dumbbell according to claim 1, wherein: the dumbbell piece adjustment system comprises a grip rod, flange driving members, a planetary gear system, and a telescopic rod, the flange driving members are fixedly assembled at both ends of the grip rod, the planetary gear system comprises an outer casing and a planetary gear mechanism disposed in the outer casing, the telescopic rod is helically driven by the planetary gear mechanism so that when the grip rod is rotated, the flange driving members drive the planetary gear mechanism to rotate and make the telescopic rod extend and retract, thereby adjusting the number of dumbbell pieces attached to the adjustable dumbbell, the locking element is fixedly mounted on the outer casing, the flange driving members extend into the outer casing, one end of each of the flange driving members toward the outer casing is provided with a locking ring with an annular structure, and the locking portion is a notch disposed on the locking ring and matching a shape of the movable pin.
 6. The adjustable dumbbell according to claim 5, wherein: the planetary gear mechanism comprises a ring gear, a planetary wheel, a planetary carrier, and a sun wheel, the planetary carrier is fixed on the outer casing, the ring gear is in linkage connection with each of the flange driving members, the sun wheel is a gear shaft with a shaft hole, and the telescopic rod is connected in the shaft hole of the gear shaft through a screw pair. 